/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.io.xml;

import java.util.Set;
import javax.xml.transform.Result;
import javax.xml.transform.Source;

/**
 * Can upgrade an older portal data XML document to a newer format of the same data. Multiple data
 * upgraders may be run in succession to translate very old data into the most recent format.
 */
public interface IDataUpgrader {

    /** @return The {@link PortalDataKey}s this upgrader can operate on */
    Set<PortalDataKey> getSourceDataTypes();

    /**
     * Upgrade the external XML data format to a newer format
     *
     * @return true if the caller should handle the importing of the result, false if this class
     *     handled it internally.
     */
    boolean upgradeData(Source source, Result result);
}
